/Engine/Source/Editor/UnrealEd/Classes/Editor/GroupActor.h
Enumerate all actors and subgroups for this group that should be moved alongside this actor (includes this).
void ForEachMovableActorInGroup ( const [UTypedElementSelectionSet](API\Runtime\TypedElementRuntime\Elements\Framework\UTypedElementSelectionSet) * InSelectionSet, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< void([AActor](API\Runtime\Engine\GameFramework\AActor) *, [AGroupActor](API\Editor\UnrealEd\Editor\AGroupActor) *)> InCallback )